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Patent Searching and Data


Title:
MANUFACTURE OF FLOATING DISPLAY MEMBER FOR CLOCK
Document Type and Number:
Japanese Patent JPS57172276
Kind Code:
A
Abstract:

PURPOSE: To obtain a display member for a clock, which is excellent in its weather resistance and shock resistance, by shearing an index, etc. of a dial substrate by use of a die and a punch, and after that, executing its compression coupling by coining working.

CONSTITUTION: A dial substrate 1 is patterned in advance, a plating layer 5 for decoration is worked, and after that, the dial substrate 1 on which a surface protective film 6 such as lacquer, etc. has been formed in placed between a knock-out 8 and a stripper 7 incorporated in a die 3, and when a punch 4 is raised relatively, a shearing crack 9 is generated, and a sheared index 2 is formed in a groove of the die 3. When the punch 4 is further inserted into the dial substrate 1, the once sheared index part 2 and the dial substrate 2 are compressed and coupled by a compressing friction effect of an inclined surface 3a of the die groove and an inclined surface 4b of the punch trapezoidal part, and a coining effect of the lower surface of the knock-out 8 and a punch upper surface 4a.


Inventors:
KODAIRA YOUICHI
Application Number:
JP5799581A
Publication Date:
October 23, 1982
Filing Date:
April 17, 1981
Export Citation:
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Assignee:
HAMASAWA KOGYO KK
International Classes:
B21D28/10; B21D31/00; G04B19/06; G04B19/10; (IPC1-7): B21D28/10; B21D31/00; G04B19/06
Domestic Patent References:
JP46037718A
JPS4934358A1974-03-29